Physicshard · Past Paper
A step-up transformer has a turns ratio of 1:20. If the primary current is 10A, what is the secondary current (assume 100% efficiency)?
A200 A
B10 A
C0.5 A
D2 A
✓ Correct Answer: C — 0.5 A
Ip/Is = Ns/Np. 10 / Is = 20 / 1. Is = 10 / 20 = 0.5 Amperes.
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